[tenfourwookie]

He could be depressed. There are things people simply can't or won't discuss at work; mental illness is one.

He could have a drug or alcohol problem. Could drug test him and get him some help if he needs it. That's a bit iffy on the technics, but I think you understand. I, for example, have been intermittently stoned for half my life. When I am: zero fucks given.

Else? Take all the weight off. No responsibilites. Then redirect him. Away from dev if necessary. The absence of work could actually motivate him, contrary as that might sound.